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Coupling effects in proton scattering from 40Ca

Mackintosh, R. S. and Keeley, N. (2012). Coupling effects in proton scattering from 40Ca. Physical Review C, 85(6) 064603.

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Recent studies showed that neutron pickup makes a substantial contribution to the proton optical model potential (OMP) for light, mostly halo, target nuclei. Here, we extend those studies to a more “normal” target nucleus: 40Ca. We present coupled reaction channel (CRC) calculations with the coupling of 30.3 MeV incident protons to deuterons and up to 12 states of 39Ca. The proton elastic scattering S matrix from the CRC calculation is subject to Slj→V(r)+l·s VSO(r) inversion and the bare potential of the CRC calculation is subtracted, directly yielding a local and L-independent representation of the dynamic polarization potential (DPP). This is appropriate for comparison with phenomenological OMPs and local OMPs derived in local density folding models. The real-central part of the DPP is repulsive and cannot be represented as a uniform normalization of the bare potential, changing the rms radius. A series of model calculations reveal the dependence of the DPP on a range of parameters illuminating (i) departures of nucleon potentials of specific nuclei from global properties, (ii) the generation of repulsion, and (iii) the requirements for all-order CRC and deuteron breakup. Light is thrown on the nonlocality of the underlying DPP.

Item Type: Journal Article
Copyright Holders: 2012 American Physical Society
ISSN: 1089-490X
Extra Information: 11 p.
Academic Unit/Department: Science > Physical Sciences
Item ID: 34254
Depositing User: Raymond Mackintosh
Date Deposited: 31 Aug 2012 09:56
Last Modified: 26 Nov 2012 19:52
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